Quote:
Originally Posted by nanomano
Stupid question... what are bulk heads? 
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its when you buy alot of heads at one time
hahah a bulk head is a threaded fitting that has a rubber seal it what goes in the holes that are drilled in a tank, the two fittings that make up a bulkhead screw together with glass inbetween them making the seal tight and then both ends can have pipe installed into them.